<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		h1 {
			color: rgba(255, 0, 0, 0.5);
		}
	</style>
</head>
<body>
	<h1>文字是可以半透明的</h1>
</body>
</html>